Numerical Simulation of Mixer-Ejector Flow Field.

Abstract

A three-dimensional explicit time-dependent full Navier-Stokes computation was carried out for a turbulent subsonic mixer-ejector flow field. The objective was to obtain better insight into the complex flow field and to utilize computational fluid dynamics (CFD) to design a mixer ejector with less jet noise while maintaining high thrust and efficiency. The grid consists of about 660 000 nodes in two blocks. The numerical simulation shows that the flow field was dominated by a system of large streamwise vortices. These vortices are created at the exit of the mixer nozzle, and they exert a significient influence on the mixing process between primary and secondary flows. Computed velocity, total pressure and total temperature distributions in the exit of the mixer ejector were compared with experimental results. Agreement between computational results and experimental ones is generally good.